Distance Traversed by Opposing Vehicle

Distance traversed by opposing vehicle, abbreviated as \(d_4\) is the distance traveled by a vehicle coming toward you.

• See  \(\large{ PSD }\) = passing sight distance

 

distance traversed by opposing vehicle formula

\(\large{ d_4 =  \frac{ 2 \; d_2 }{ 3 }   }\)
\(\large{ d_4 =  \frac{ 2 }{ 3 } \; d_2   }\)

Where:

Units	English	Metric
\(\large{ d_4 }\) = distance traversed by opposing vehicle	\(\large{ft}\)	\(\large{m}\)
\(\large{ d_2 }\) = distance while passing vehicle occupies left lane	\(\large{ft}\)	\(\large{m}\)